STEERING LOCK SYSTEM, Diagnostic DTC:B2781

DTC Code DTC Name
B2781 Open / Short in Steering Lock ECU

DESCRIPTION

The steering lock ECU and steering lock motor are built into the steering lock actuator assembly.

The steering lock ECU detects whether the steering lock is in the lock or unlock position by using the lock position sensor of the steering lock motor.

The steering lock ECU receives lock and unlock request signals from the certification ECU (smart key ECU assembly) and responds with lock and unlock operation signals.

Tech Tips

The steering lock ECU is not connected to the CAN communication system. However, the steering lock ECU is connected to the certification ECU (smart key ECU assembly) via LIN communication and communicates with other components via CAN communication through the certification ECU (smart key ECU assembly).

DTC No. Detection Item DTC Detection Condition Trouble Area DTC Output from
B2781 Open / Short in Steering Lock ECU

One of the following conditions is met (1- trip detection logic*1):


  • The steering lock/unlock position sensor is malfunctioning.*2

  • The steering lock motor activation circuit has a short circuit.

  • The steering lock motor activation circuit has an open circuit.

  • Steering lock ECU (Steering lock actuator assembly)

  • LIN communication system

 No confirmation operation is necessary (monitoring is continuous).

A01QQJIE10
Vehicle Condition and Fail-safe Function when Malfunction Detected
Vehicle Condition when Malfunction Detected Fail-safe Function when Malfunction Detected
The steering cannot be locked or unlocked. For this reason, the engine cannot be started. Prohibits the engine from being started (the engine does not crank).
Related Data List and Active Test Items
DTC No. Data List Item Active Test Item
B2781

    Entry&Start

  • Sensor Value

  • Motor Driver Short

 -

CAUTION / NOTICE / HINT

Note


  • When using the GTS with the engine switch off to troubleshoot:

    Connect the GTS to the DLC3 and turn a courtesy light switch on and off at 1.5 second intervals until communication between the GTS and vehicle begins.

  • After performing repairs, confirm that no DTCs are output again.

    Click here

  • When replacing the steering lock ECU (steering lock actuator assembly), registration must be performed (Refer to the Service Bulletin).

Tech Tips

When all the ECUs that are connected to the LIN communication cannot communicate with the certification ECU (smart key ECU assembly), DTC B2785 is stored.

PROCEDURE


  1. CHECK DTC


    1. Using the GTS, check if LIN communication DTC B2785 is output.

      Click here

      Tech Tips

      If a LIN communication DTC is output, perform troubleshooting for the LIN communication system.

      Click here

      Result
      Proceed to
      DTC B2785 is output.
      DTC B2785 is not output.

    DTC B2785 is output.

    GO TO LIN COMMUNICATION SYSTEM (DTC B2785) Click here

    DTC B2785 is not output.

    REPLACE STEERING LOCK ECU (STEERING LOCK ACTUATOR ASSEMBLY) Click here